Github user srdo commented on a diff in the pull request:
https://github.com/apache/storm/pull/1808#discussion_r96733517
--- Diff:
external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/Subscription.java
---
@@ -0,0 +1,62 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.storm.kafka.spout;
+
+import java.io.Serializable;
+
+import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.storm.task.TopologyContext;
+
+/**
+ * A subscription to kafka.
+ */
+public abstract class Subscription implements Serializable {
+ private static final long serialVersionUID = -216136367240198716L;
+
+ /**
+ * Subscribe the KafkaConsumer to the proper topics
+ * @param consumer the Consumer to get.
+ * @param listener the rebalance listener to include in the
subscription
+ */
+ public <K, V> void subscribe(KafkaConsumer<K,V> consumer,
ConsumerRebalanceListener listener, TopologyContext context) {
+ subscribe(consumer, listener);
+ }
+
+ /**
+ * Subscribe the KafkaConsumer to the proper topics
+ * @param consumer the Consumer to get.
+ * @param listener the rebalance listener to include in the
subscription
+ * @deprecated please use the version with the TopologyContext in it
+ */
+ public <K, V> void subscribe(KafkaConsumer<K, V> consumer,
ConsumerRebalanceListener listener) {
+ throw new IllegalStateException("At least one subscribe method
must be overwritten");
+ }
+
+ /**
+ * @return a string representing the subscribed topics.
--- End diff --
Can this string be in any format? It seems to only be used in
getComponentConfiguration, not really sure where that's being read.
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